"Why, if you really think that way," said Newt, his ears pounding with fury, "then you're just a great big meanie!" It turns out Newt avoided all swearing because he was so nice and wholesome. This is canon now.
"I don't have to take this," replied Grimmson, getting up from the bar. "Goodbye, Scamander." With that, he Disapparated.
"We must stop Grimmson!" said Newt, turning to Tina. "The Mokele-mbembe is extremely rare, and close to extinction!"
"We don't have time for side missions, Mr. Scamander," she said. "We must stop Grindelwald at all costs!"
"I will not allow the Mokele-mbembe to go extinct when I could have stopped it!" Newt insisted gallantly.
"Have you forgotten that ALL fantastic beasts will go extinct if we fail to stop Grindelwald?"
Newt sighed. He had indeed forgotten about that. Still, he couldn't sacrifice all the Mokele-mbembes "for the greater good." That would make him no different from Grindelwald, and that would be very bad!
"We must look for the lost city, Mr. Scamander," said Tina, with mounting sexual tension.
"And we will... in the swamps where the Mokele-mbembes live," agreed Newt, leaning in as though he were about to kiss her, but then he didn't because that would ruin all the delightful sexual tension.
"Well, I - I suppose it could be there," said Tina, blushing tsunderely. "We might as well go check it out, right?"